<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
  <p v-if="show">这是一段文本</p>
</div>
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>
<script>
    var app =   new Vue({
        el: '#app',
        data: {
            show: true
        },
        methods:{
            init:function (text){
                console.log(text);
            }
        },
        mounted:function (){
            this.init('在初始化时调用');
        }
    });
    app.init('通过外部调用');
</script>
</body>
</html>